I have a quick suggestion for a Third party asset that is not yet mentioned in the Wiki: Lighting Database.

Lighting Database is a Database tool for Unity that has an amazing Playmaker integration. It auto-generates actions to access and alter your database via Playmaker, making it very powerful as a starting point to organize accessible Data (Save & Load).

One of the most amazing features though was just recently added : It allows you to spawn a GameObject from any object that is defined in your database and it will add a FSM to it that has all your predefined variables already in the FSM.

That means if you organize your objects in Lighting Database you can easily use them with Playmaker without having to manually add all the variables again. This way it is a kind of FSM catalogue, giving you great flexibility over your data.

https://www.assetstore.unity3d.com/en/#!/content/68444

The developer is also very friendly and always searches for feature requests to improve usability and Playmaker integration. This needs to be on the wiki imo!